Apparatus for controlling power factor compensation in inverter control circuit and method thereof

Abstract

The present invention provides an apparatus for controlling power factor compensation and method thereof, in which a turn-on timing point of a power factor compensation switch is delayed by a prescribed time from a zero crossing timing point to enhance a power factor. The present invention includes periodically detecting a zero crossing time point of an inputted voltage, turning on the power factor compensation switch if a turn-on time point of the power factor compensation switch set to a time point delayed by a prescribed time from the detected zero crossing time of the inputted voltage is reached, and turning off the power factor compensation switch if a prescribed time passes after turning on the power factor compensation switch.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an inverter control circuit, and more particularly, to an apparatus for controlling power factor compensation and method thereof, in which a delay of a turn-on timing point of a power factor compensation switch is controlled to enhance a power factor.[0003]2. Discussion of the Related Art[0004]Generally, an air conditioner is a home appliance for maintaining a room air optimal to its usage and purpose. For instance, the air conditioner controls the room air to provide a cooling state to a room in summer or a heating state to the room in winter. The air conditioner adjusts humidity within the room. And, the air conditioner refines the room air into a clean and pleasant state.[0005]As convenient home appliances such as the air conditioner propagate to become popular in use, the user's demand for high energy efficiency, performance enhancement, and convenience of the products rises.[0006]Mo...

AI Technical Summary

Benefits of technology

The present invention is an apparatus and method for controlling power factor compensation in an inverter control circuit. The apparatus includes a power factor compensation switch that is turned on at a specific time point, which is delayed from the zero crossing point of the inputted voltage. The delay time is adjusted based on the load size and the DC link voltage. The apparatus can also adaptively control the timing of the power factor compensation switch based on the load size. The technical effects of the invention include improving power factor compensation, reducing load voltage, and improving motor performance.

Problems solved by technology

As harmonic hindrance accelerates degradation of various power devices, their endurances are shortened, the danger of fire due to overheating and the like is aggravated, and null power increases to waste power consumption.

However, since the switch of the power factor compensator is turned on at the zero crossing timing point of the power voltage, the related art puts limitation on the power factor enhancement.

Hence, it is unable to uniformly control the power factor for a wide operational range of the load, whereby the power factor enhancement is limited.

Moreover, if the DC voltage needed by the circuit is low, it may be difficult to control the DC voltage uniformly.

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